<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="bootstrap-5.3.0-dist/css/bootstrap.min.css">
</head>
<body>
  <button type="button" class="btn btn-outline-primary btn-lg">大按钮</button>
  <button type="button" class="btn btn-outline-primary">默认按钮</button>
  <button type="button" class="btn btn-outline-primary btn-sm">小按钮</button>
</body>
</html>